export interface ImageDimensions {
    width: number;
    height: number;
}
/**
 * The pixel size a browser will lay an uploaded image out at, or null when it
 * cannot be read.
 *
 * `autoOrient` rather than the top-level width/height, because `metadata()`
 * reports the stored pixels: a phone photo carrying EXIF orientation 6 is stored
 * landscape and displayed portrait, and recording the stored shape would reserve
 * a landscape box around a portrait picture — the layout shift this exists to
 * prevent, wearing a hat. The thumbnail path has the same rule as `.rotate()`.
 *
 * This reads the container header instead of decoding the pixels, so it is cheap
 * enough to sit on the upload request tick. Null on any failure: an attachment
 * with no dimensions renders on the client's fallback, but a probe that threw
 * must never cost the caller their upload.
 */
export declare function readImageDimensions(buffer: Buffer): Promise<ImageDimensions | null>;
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